1. Africa Health Research Institute, University of KwaZulu-Natal, South Africa
2. School of Public Health, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa
3. DST-NRF Centre of Excellence in Human Development, University of Witwatersrand, Johannesburg, South Africa
4. Human and Social Development Research Programme, Human Sciences Research Council, Durban, South Africa
5. MRC/Developmental Pathways to Health Research Unit, School of Clinical Medicine, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, South Africa,
6. Section of Child and Adolescent Psychiatry, Department of Psychiatry, Oxford University, Oxford, UK
7. Institute of Health and Wellbeing and Royal Hospital for Sick Children, University of Glasgow, Glasgow, UK